Development Of Fuselage Tail Defect Imaging Method And Portable System

The surface copper mesh foam sandwich CFRP has the advantages of high strength,light weight,strong oxidation resistance and good lightning protection effect,which has been widely used in the field of aerospace industry.In the production and use of the process,prone to delamination,debond and impact defects,reduce the performance of the material,so the material tracking imaging detection has become a difficult problem,the current detection in the main use of ultrasonic methods.According to the characteristics of the composite material of the tail section of the fuselage,this paper analyzes the method of ultrasonic imaging technology,and develops a portable ultrasonic feature scanning imaging system for tracking imaging detection.First of all,the structure characteristics of the fuselage tail section are analyzed,and the research of the detection method and the accurate quantitative research are carried out according to the typical defects(delamination,debond,impact)set in the fatigue damage experiment.Analysis of interference factors(copper mesh and foam),identification methods and imaging methods.The use of ultrasonic imaging tomography imaging method to solve difficulties.Design and manufacture of samples with artificial defects,the use of tomographic imaging method,the results are intuitive and reliable.Then,according to the detection requirement and structure characteristics of the outfield fuselage tail section of composite materials.The research and development of portable ultrasonic feature scan imaging system comprises a fixing device,a mechanical scanning device,motion control system and signal synchronization system.With a portable,stable contact,high precision positioning system,stability of motion of complete and strong anti-interference ability,control minimum step of 0.02 mm data acquisition,resolution of 0.1mm,the detection depth resolution of 0.01 mm.Finally,the fuselage tail section typical defect tracking imaging detection using a portable ultrasonic feature scan imaging system,aiming at three kinds of defects using tomography method for analyzing and processing the results of quantitative accuracy,high repeatability.The research results show that the ultrasonic feature scan imaging technology tomographic imaging method for identifying delamination,debond and impact defects,portable imaging system in imaging detection,suitable for surface and irregular surface detection,quantitative accuracy of 0.1mm,the detection results show that the tomography method for defect recognition,has high reproducibility and reliability the characteristics,to meet the requirements of tracking and imaging detection on the tail section of the fuselage.